The key point is that he impulsively shared this 'childish' idea everywhere, and when he didn't receive a response from others, he felt dissatisfied and disheartened. Perhaps he's encountered this kind of situation many times before, so he regards verbal support from someone like Zavier as mere perfunctory words.
So naturally, he was dissatisfied, even if he had just signed a purchase contract with the other party—for a young genius, such a reaction is completely normal.
There are too many young geniuses these days who don't understand much about society or social interaction, and even have certain 'flaws' in their character, which make them appear foolish to others. But because this era is a period of great upheaval and development, young people can understand nothing else but still rely on their brilliant minds and exceptional skills in a particular field to amass billions in wealth.
Without a doubt, Mr. Yan is one of those.
...
